import pymysql
class DB:
    #初始化
    def __init__(self):
            self.conn = pymysql.connect(host='localhost',port=3306,user='root',password='mysql',db='md2104',charset='utf8',cursorclass=pymysql.cursors.DictCursor)
            self.coursor = self.conn.cursor()
    #查找所有
    def findall(self,sql):
        self.coursor.execute(sql)
        return self.coursor.fetchall()

    #查找单个
    def findone(self,sql):
        self.coursor.execute(sql)
        return self.coursor.fetchone()
    #添加
    def insert(self,sql):
        self.coursor.execute(sql)
        self.conn.commit()
    #关闭
    def close(self):
        self.coursor.close()
        self.conn.close()

db = DB()